Dogging mechanism for sawmills



J. B. WEIR.

DOGGING MECHANISM FOR SAWMILLSH APPLICATION FILED OCT-II, I918-1,394,128. Patented Oct. 18, 1921.

' 2 SHEETS-SHEET I.

I J. B. WEIR. DOGGWG MECHANISM FOR SAWMILLS.

2 SHEETS-SHEET 2.

Patented Oct. 18, 1921 llum .@\lll\ll\ll\\li APPLICATION FILED OCT. 1],(918.

UNITED STATES PATENT OFFICE.

CANADA.

DOGGING MECHANISM FOR SAEVMILLS.

Specification of Letters Patent.

Patented Oct. 18, 1921.

Original application filed August 16, 1518 Serial No. 250,144. Dividedand this application filed October To (JZ wizom it may concern.

Be it known that T, JOHN B. .Vnra, a citizen of the United States,residing at Vancouver, in the Province of British Columbia, Dominion ofCanada, have invented certain new and useful Improvements in DogginMechanism for Sawmills, of which the. following is a specification.

This invention relates to improvements in saw mills and particularly topower-operated dogging mechanism therefor, the principal object of theinvention being the pro vision of such a construction wherein theoperation of the power operated dogging mechanism is under control of anoperator located elsewhere than on the carriage, such as the sawoperator or other person.

Heretofore in machines of this character, it has been customary toprovide an operator for the saw and an operator on the carriage, thefirst operator supervising the operation of the saw and the secondoperator supervising and controlling the operation of the set work andthe dogging mechanism.

By constructing the apparatus as set forth in this application, it isobvious that the control and operation of the dogging mechanism may beunder the control of one operator who also supervises the operation ofthe saw.

A further object of this invention is the pro 'ision of a fluid pressureoperated doging mechanism, the control for which is located adjacent anindicating and controlling mechanism for the setworks whereby the sameoperator who controls the set works may also control the setting of thedogging mechanism, this operator being located off the carriage. Thesawyer or other person may perform this service.

ther objects of this invention include improvements in details ofconstruction and arrangement, whereby an efi'ective mechanism isprovided to accomplish these and other purposes which will be apparentfrom a. consideration of the following specification.

This application is filed as a division of my prior application, filedAugust 16th, 1918, Serial No. 250,144.

To the accomplishment of the foregoing and such other objects as mayhereinafter appear, my invention consists in the con struction,combination and arrangement of parts hereinafter described and thendefined Serial No. 257,697.

in the claims, the accompanying drawings forming a part hereof, andwhich show, merely for the purpose of illustrative disclosure, apreferred embodiment of my invention, it being expressly understoodhowever that various changes may be made in practice within the scope ofthe claims without digressing from my inventive concept.

In the drawings:

Figure 1 represents a top plan view of a saw mill carriage and operatingmechanism constructed to embody my invention, part of the arrangementbeing diagrammatic for convenience in illustration.

Fig. 2 is a side elevation of the mechanism shown in Fig. 1, parts beingbroken away to facilitate the disclosure.

Fig. 3 is a vertical transverse section taken substantially on line 3-3of Fig. 2, and on a scale somewhat enlarged over that figure.

Fig. 4: is detail view in plan and section of the controlling end of thefluid pressure means for operating the dogging mechanism.

In the drawings the numeral 1 designates the frame of the saw millcarriage, which is movably supported on the trucks or wheels which runon the guides or track 3, as well understood, so as to present the logsto the saw, the position of which is indicated in Fig. 1 of thedrawings. This carriage is moved back and forth by means of the oistonof a fluid pressure operated mechaisin, or any other suitable mechanism,as is well understooo in this art.

' Arranged transversely of the carriage and supported in an upstandingposition thereon, are the pairs of Z-bars 5, which are s aced apart andarranged in opposed relation to provide a slot or opening therebetween,extending transversely across the carriage. Suitable supporting bars orplates 6 rest upon the upper flanges of said Z-bars to support the logsto be cut. The knees T are slidably arranged on said plate members. eachbeing provided with the bearing portion 8, and also with the depending:sleeve 9 which is positioned between said Z-bar members 5, each sleeve 9being internally screw threaded to receive the screw threaded rod orshaft 10 which extends transversely across the carriage. On the end ofthis shaft 10 I provide the beveled rod or shaft l, which is connectedto the pinion 11 which. meshes with the corresponding beveled pinion 12on the set shaft 13, which extends longitudinally of the carriage and issupported in suitable brackets or arms 14: extendin outwardly therefrom.This shaft 13 is driven in either direction from a suitable source ofpower by means fully disclosed in the original application and thereforeneed not be disclosed or described in this application.

The means for controlling the operation of the knees is mounted on apedestal 15 located to one side of the machine and off the carriage andpreferably adjacent the position assumed by the sawyer, so that he cancontrol and operate the set works, as clearly disclosed and described inthe above mentioned original application.

I provide fluid pressure operating dogging mechanism which is controlledfrom the same pedestal 15 so that the dogging mechanism may be set bythe same operator who controls the adjustment of the knees and alsosupervises and controls the operation of the saw. This mechanismincludes the extension 16 of one of the knees which forms the cylindercover for the cylinder 17, in which cylinder is mounted a piston towhich is connected the piston rod or shaf 18 which is elongated andextends longitudinally of the carriage and is loosely movable throughknees 7. Another rod, or shaft 19, is positioned above and inparallelism with this first mentioned rod or shaft and is also movablyarranged in the knees. These rods, or shafts 18 and 19, are con nectedtogether for cooperative movement by means of the toggle lever 20 whichhas the bifurcated end portion 21 engaging said rods or shafts betweenthe collar members 22. This tog le lever is pivoted as at 20 to the armor bracket 23 extending from one side of one of the knees 7, as clearlyshown in Fig. 2 of the drawing.

To one end of the rod or shaft 18, I socurely connect the dog 24. To theother end of shaft 19 I secure a s milar dog 25 which "slidably receivesthe free end of the other shaft 18. It is seen, therefore, that when thepiston in cylinder 17 is moved, shafts 18 and 19 will be moved inopposite directions so as to move the dogs to a setting or releaseposition, depending upon the direction of movement of said piston in thecylinder. Of course, it is to be understood that this mechanism issuitable for use only with logs of substantially the same or uniformlength, as the dogs engage the ends of the logs.

The movement of the piston in the cylinder 1'? is controlled by steam,or other fluid under pressure, admitted to either one of pipes 26 whichare telescopically arranged in the larger pipes 27, leakage beingprevented by the expansion joint 28. These pipes or messes pipes QTpassthrough pipes 29 into larger pipes or tubes 30 and have on the endsthereof suitable heads 31 shown particularly in Fig. at. To the ends ofthese pipes or tubes 30 are connected the inlet and exhaust pipes whichare connected to a fourway valve 83 to provide a union with the diecharge or exhaust pipe 34: and supply pipe the turning plug member ofthe valve being designated 36, and operated by a lever 37 and link 88which link is connected to link 39 by a bell crank 41. Link 39 isconnected to a vertically arranged shaft 42 in the pedestal, on theupper end of which shaft is a controlling lever 40, which is positionedon top of the pedestal 15 so as to be convenient for operation by thesame operator who controls the saw and the setting of the knees.

In the position of the parts shown in Fig. 1 and also in Fig. l of thedrawing, fluid pressure is admitted to the upper one of the tubes orpipes 30 into the front end of cylinder 17, so that the piston thereinis forced to the right, in Fig. 1, thereby holding the shafts 18 and 19and the dogs 24: and 25 in the release or extended positions, shown inFig. 2 of the drawing. lVhen fluid under pressure is admitted to thelower one of the tubes 30, it will pass through the connection showninto the rear end of the cylinder 17 and drive the piston therein to theleft, so as to set the dogs 2% and 2-5 upon the ends of the logs, as iswell understood.

It is to be noted that the arrangement of the connections for operatingthese various mechanisms as shown in the drawings is rather diagrammaticand conventional and any other arrangement may be made which will befound best in practice.

Having described my invention, what I claim is V 1. A mechanism of thecharacter described including in combination, a saw mill carriage,dogging mechanism thereon, including a shaft and fluid pressure meansfor moving said shaft, an additional shaft operatively connected to saidfirst shaft to move in opposition thereto, and a dog connected to oneend of one shaft and a dog connected to the other end of the other shaftbetween which to secure alog.

2. A mechanism of the character described including in combination, asaw mill carriage, dogging mechanism thereon, including a shaft andfluid pressure means for moving said shaft, an additional shaftoperatively connected to said first shaft to move in opposition theretoand a dog connected to one end of one shaft and a dog connected to theother end of the other shaft to move said dogs toward and from eachother and means for controlling said fluid pressure means located offthe carriage.

3. A saw mill carriage adapted to receive lll and hold logs of asubstantially predetermined length, setting knees thereon, a pair ofshafts loosely mounted in said setting knees and extendinglongitudinally of the carriage, a dog secured to one end of one shaftand another dog secured to the other end of the other shaft and meansfor operating said shaft to cause them to move in opposite directions toset or release the dogs from engagement with the ends of the log.

4. A saw mill carriage adapted to receive and hold logs of asubstantially predetermined length, setting knees thereon, a pair ofshafts loosely mounted in said knees, and extending longitudinally ofthe carriage, a dog secured to one end of one shaft and another dogsecured to the other end of the other shaft, said dogs being adapted toengage the ends of the log, a connection between said shafts so as tocause them to move in opposite directions and means for actuating one ofsaid shafts whereby the dogs will be moved to set Or release positionwith respect to the log.

5. A mechanism of the character described including in combination a sawmill carriage, a plurality of knees thereon, a pair of shafts looselymounted in said knees, alever pivotally connected to one of said kneesand operatively connected to said shafts, whereby when one of saidshafts is moved in one direction, the other Will be moved in the otherdirection, a dogon the end of one of the shafts, another dog on theother end of the other of said shafts, said dogsbeing adapted to engagethe ends of the log, and means for moving one of said shafts so as toset or release said dogs.

In testimony whereof I hereunto subscribe my name.

JOHN BROOMFIELD WEIR.

